How does it mean more biometrics? Many governments already issue plastic ID cards; it's possible to embed a smart card chip in these and use the ID as a secure remote authentication method with almost any smartphone.
Such an infrastructure needs to be neither centralized nor government-run: If you prefer state/local governments to be in charge of ID, or even private notary-like entities, you totally can.
Stronger guarantee makes it a more attractive target. If some magic token is an absolute proof that it is you then lose that token and go prove to someone that you is you. Just lose your card and if I find it then I am you and you're done.
Such an infrastructure needs to be neither centralized nor government-run: If you prefer state/local governments to be in charge of ID, or even private notary-like entities, you totally can.